I made an Android game some months ago and released it on play store. Here’s link if you want to give it a try and see how JME is working for 2d games: [ARCADE] [ANDROID] Karma Siege
If you don’t want to attach everything to guiNode you can maybe write a class that acts like a proxy from 2d to 3d,transforming your 2d coordinates into a Vector3f that’s suitable to be used as a local translation,and attach everything to rootNode. However,this is a bit tricky and you have to transform coordinates really precisely or you can have some issues with things like click events.